70dusterpink
Well-Known Member
I have a 67 barracuda With a 318, 904, 4.10 gears...
Running a 25" tall tire...
At 60 mph I calculate my rpms to be 3300....
My tach is reading 4500-5000 cruising around 50-60mph...
The tach reads 3500rpm when I am going 41mph...
I know this is way off.... What could be the problem... It's a aftermarket tach... It's old... What side of the coil should it be hooked to? Maybe I have a bad ground?
As a side note i was wondering why the car wasn't coming alive till 4000 lol... Because that's more like 2700 lol
Running a 25" tall tire...
At 60 mph I calculate my rpms to be 3300....
My tach is reading 4500-5000 cruising around 50-60mph...
The tach reads 3500rpm when I am going 41mph...
I know this is way off.... What could be the problem... It's a aftermarket tach... It's old... What side of the coil should it be hooked to? Maybe I have a bad ground?
As a side note i was wondering why the car wasn't coming alive till 4000 lol... Because that's more like 2700 lol